<?php


namespace Interpreter\Expression;


class ExpressionNum implements Expression
{
    function interpreter(string $str): string
    {
        switch ($str) {
            case "0":
                return "零";
            case "1":
                return "一";
            case "2":
                return "二";
            case "3":
                return "三";
            case "4":
                return "四";
            case "5":
                return "五";
            case "6":
                return "六";
            case "7":
                return "七";
            case "8":
                return "八";
            case "9":
                return "九";
            default:
                return '';
        }
    }
}